In retrieve_plocks_stored() there is the code: retrieve_plocks(ls, &sig); if ((hd->flags & DLM_MFLG_PLOCK_SIG) && (sig != hd->msgdata2)) { log_error("lockspace %s plock disabled our sig %x " "nodeid %d sig %x", ls->name, sig, hd->nodeid, hd->msgdata2); ls->disable_plock = 1; ls->need_plocks = 1; /* don't set HAVEPLOCK */ ls->save_plocks = 0; return; } Node 1 is getting rc=12 from saCkptCheckpointOpen (SA_AIS_ERR_NOT_EXIST). However, this error is ignored and we process the sig value as if is valid rather than an uninitialized value that was never set by the retrieve_plocks() function. So I guess the question is why can't it find the checkpoint file and/or what is the correct action when the sig value cannot be retrieved? Neale On Sep 2, 2014, at 12:02 PM, Neale Ferguson <neale@xxxxxxxxxxxxxx> wrote: > Thanks David, > That makes sense as there's this message that precedes the disable message in the log: > > retrieve_plocks ckpt open error 12 lvclusdidiz0360 > > Neale > > On Sep 2, 2014, at 11:37 AM, David Teigland <teigland@xxxxxxxxxx> wrote: > >> On Tue, Sep 02, 2014 at 02:56:52PM +0000, Neale Ferguson wrote: >> >>> 1409631951 lockspace lvclusdidiz0360 >>> plock disabled our sig 816fba01 nodeid 2 sig 2f6b >> >> There is a difference in plock data signatures between the node that wrote >> the data and the node that read it (this one). This indicates that the >> plock data was not synced correctly by the openais/corosync checkpoints, >> or that the signatures were not synced correctly (e.g bug 623816). >> > > > -- > Linux-cluster mailing list > Linux-cluster@xxxxxxxxxx > https://www.redhat.com/mailman/listinfo/linux-cluster -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster